## general science

### Chemistry MCQ Questions and Answers page - 8

1.
 Which of the following can  NOT  act as a bleaching agent  ? A Hydrogen peroxide B Nitrous oxide C Chlorine D Sulphur dioxide Answer : A Explanation :
2.
 Milkiness observed on passing carbon dioxide through lime water is due to the formation of  : A Calcium hydroxide B Calcium bicarbonate C Calcium carbonate D Calcium chloride Answer : C Explanation :
3.
 Brown ring test is used for the detection of A Phosphate B Sulphate C Nitrate D Chlorate Answer : C Explanation :
4.
 What is the common name of CaOCl2  ? A Baking Power B Baking Soda C Bleaching Power D Washing Soda Answer : C Explanation :
5.
 Which of the flowing is the common name of Phosgene  ? A Carbonyl chloride B Phosphine C Carbon tetrachloride D Phosphorus trichloride Answer : A Explanation :
6.
 Which of the following chemicals is used as rodenticide  ? A Copper sulphate B Zinc sulphate C Iron sulphate D None of these Answer : B Explanation :
7.
 Which of the following compounds is used as drying agent  ? A Calcium oxide B Gypsum C Calcium chloride D Calcium hydroxide Answer : A Explanation :
8.
 Which of the following is slaked lime  ? A $Ca\left&spac B $CaO$ C $CaCO_{3}$ D $CaCl_{2}$ Answer : A Explanation :
9.
 Aqua regia is a mixture of  _____________ . A Dilute hydrochloric acid and concentrated nitric acid B Dilute sulfuric acid and dilute hydrochloric acidic C Concentrated sulfuric acid and Dilute nitric acid D Concentrated hydrochloric acid and Concentrated nitric acid Answer : D Explanation :
10.
 Which acid is the most abundant acid found in grapes  ? A Oxalic acid B Ascorbic acid C Tartaric acid D Formic acid Answer : C Explanation :
11.
 Hydrogen chloride is  ___________ . A Diatomic B Triatomic C Polyatomic D No option is correct Answer : A Explanation :
12.
 Which of the following solution is used in black and white photography  ? A Silver chloride B Silver bromide C Silver iodide D All options are correct Answer : D Explanation :
13.
 Which acid is found in ant’s sting  ? A Acetic acid B Formic acid C Ascorbic acid D Citric acid Answer : B Explanation :
14.
 Which of the following is  NOT  a from of calcium carbonate  ? A Lime water B Lime stone C Chalk D Marble Answer : A Explanation :
15.
 What is the chemical formula of baking soda  ? A $Na_{2}CO_{3}.10H_{2} B $Na_{2}CO_{3}$ C $NaHCO_{3}$ D NaOH Answer : C Explanation :
16.
 Catalyst is a substance which A Increases the rate of the reaction B Decreases the rate of reaction C Has no action on the rate of the reaction D None of these Answer : D Explanation :
17.
 Alum stops bleeding in minor cuts because of A Solvation B Emulsion C Dialysis D Coagulation Answer : D Explanation :
18.
 A substance which readily forms colloidal solution in contact with water is called A Extrinsic colloid B Associated colloid C Hydrophobic colloid D Hydrophilic colloid Answer : D Explanation :
19.
 An emulsion is a colloid of a A Gas in a liquid B Liquid in a liquid C Liquid in a gas D Gas in a solid Answer : B Explanation :
20.
 Water is not effective in extinguishing a fire caused by petrol because A The flame is too hot for water to cool it down B Water and petrol react chemically C Water and petrol are miscible with each other D Water and petrol are immiscible with each other and petrol which froms the upper layer continues Answer : D Explanation :
21.
 An emulsifier is an agent which A Stabilises an emulsion B Aids the flocculation of an emulsion C Accelerates the dispersion D Homogenises an emulsion Answer : A Explanation :
22.
 Which one of the following is used as a sowing agent in the preparation of soft drinks  ? A Phosphoric acid B Phosphorus acid C Salicylic acid D Boric acid Answer : A Explanation :
23.
 Which type of radiations are absorbed by the upper layer of the atmosphere  ? A Radio-waves B Infrared C Visible D Ultraviolet Answer : D Explanation :
24.
 An example of replenshible energy source is A Coal B Petroleum C Lignite D Biomass Answer : D Explanation :
25.
 Tar roads get damaged if there is A Stagnation of water on road B Heavy traffic C No maintenance D No sloping Answer : A Explanation :
26.
 The drug  ‘Marijuana’  is a A Sedative B Mental stimulant C Hallucinating substance D Tranquillizer Answer : A Explanation :
27.
 Gelatin is mostly used in making ice-creams in order to A Prevent making a colloid B Stabilise the colloid and prevent crystallisation C Stabilise mixture D Enrich the aroma Answer : B Explanation :
28.
 Which halide is used in making sensitive emulsion on photographic film  ? A Sodium chloride B Silver bromide C Silver iodide D Silver chloride Answer : B Explanation :
29.
 In the electroplating of gold, the electrolyte used is A Gold chloride B Gold nitrate C Gold sulphate D Potassium aurocyanide Answer : C Explanation :
30.
 Refrigerators keep food unspoiled because A At its low temperature, bacteria and moulds are inactive B At its low temperature, the germs are killed C At its low temperature, the germs are frozen D It sterilises the food Answer : A Explanation :
31.
 The unit of ionic product of water (Kw) is  : A $Mol^{2}&space;lit^{-1 B $Mol^{2}&space;lit^{-2 C $Mol^{-1}&space;lit^{ D $Mol^{-1}&space;lit^{ Answer : B Explanation :
32.
 Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives A Copper at cathode and oxygen at anode. B Copper at anode and oxygen at cathode. C Copper at cathode and anodes dissolve to give copper. D Hydrogen at cathode and oxygen at anode. Answer : A Explanation :
33.
 Burning pyrites ore gives out A Carbon dioxide gas B Sulphur dioxide gas C Nitrogen dioxide gas D Nitric dioxide gas Answer : B Explanation :
34.
 Which one of the following is an example of a gel  ? A Cheese B Milk C Face cream D Shaving cream Answer : C Explanation :
35.
 When a spoon is to be electroplated with nickel the spoon is A Dipped in a nickel sulphate solution B Made anode and a pure nickel rod, the cathode C Made cathode and a pure nickel red, the anode D Coated with nickel sulphate and dried Answer : C Explanation :
36.
 The process by which milk is concerted to curd is called A Pasteurization B Vernalization C Fermentation D Retting Answer : C Explanation :
37.
 The function of sedimentation tank in sewage treatment is to  : A Disinfect the sewage B Remove water content C Aerate the sewage D Remove suspended solids Answer : D Explanation :
38.
 The liquid waste from kitchens and baths, of residences is known as  : A Domestic sewage B Storm water C Sullage D Refuse Answer : C Explanation :
39.
 Which of the following is biodegradable  ? A Paper B D.D.T. C Aluminium D Plastic Answer : A Explanation :
40.
 Earth’s atmosphere is an envelope of gases extending to a height of A 100 km B 150 km C 200 km D 300 km Answer : C Explanation :
41.
 The sewage obtained from water closets and urinals is known as A Sanitary waste B Industrial waste C Garbage D Sullage Answer : A Explanation :
42.
 Maximum permissible concentration of total hardness in drinking water is A 50 B 100 C 200 D 500 Answer : C Explanation :
43.
 Which of the following is a method/process of disposing of solid waste which cannot be reused or recycled  ? A Landfills B Incineration C Pyrolysis and Gasification D All the above Answer : D Explanation :
44.
 Hard water and soft water can be distinguished by using A Dilute acid B Ordinary soap C Detergent D Liquid soap Answer : C Explanation :
45.
 Water cycle refers to A An integrated attempt to recycle water in relatively arid regions B Constant movement of water from ocean to land and back to ocean once again C Scientific management of water in areas excessively plagued with water logging D Water distribution in relatively dry areas Answer : B Explanation :
46.
 Hardness of the water is commonly measured in terms of A Calcium carbonate equivalents B Calcium sulphate equivalents C Magnesium carbonate equivalents D Magnesium sulphate equivalents Answer : A Explanation :
47.
 The unit to measure the flow of water is A Micro Mho B Ohm meter C Milli-curie D Cusecs Answer : D Explanation :
48.
 Surface water is a better source of drinking water because it is poor in A Dust B Bacteria C Arsenic D Algae Answer : C Explanation :
49.
 The enormous amount of energy released in an explosion of an atomic bomb is due to the A Conversion of mass into energy B Conversion of chemical energy into heat energy C Conversion of mechanical energy into nuclear energy D Conversion of neutrons into protons Answer : D Explanation :
50.
 The hottest part of the gas flame is known as A Blue zone B Non-luminous zone C Luminous zone D Dark zone Answer : C Explanation :
51.
 If the sewage is fully oxidized, the nitrogen is in the form of A Nitrites B Ammonia C Nitra-mines D Nitrates Answer : D Explanation :
52.
 Piped Natural Gas (PNG) is used for A Mining B Welding C Anaesthesia D Cooking Answer : D Explanation :
53.
 The degree of dissociation of an electrolyte depends on A Dilution B Impurities C Atmospheric pressure D Method of dissolution Answer : A Explanation :
54.
 The pH of lemon juice is expected to be A Equal to 7 B Nothing can be predicted C Less than 7 D More than 7 Answer : C Explanation :
55.
 In electro-refining the pure metal is deposited on A Vessel B Electrolyte C Cathode D Anode Answer : C Explanation :
56.
 The open  “Sigrees”  or coal stoves often require fanning to sustain burning because of A Tendency of carbon dioxide to form a layer along with dust smoke B Lack of oxygen in the surroundings of sigrees C Accumulation of smoke and dust over the sigrees D Interrupted release of moisture from the material Answer : A Explanation :
57.
 Combustion of a candle is  a/an A Photochemical reaction B Physical change C Endothermic reaction D Exothermic reaction Answer : D Explanation :
58.
 pH scale ranges from A 0 – 7 B 8 – 14 C 0– 14 D None Answer : C Explanation :
59.
 For a spontaneous process A $\Delta&space;G&spa B $\Delta&space;G&spa C $\Delta&space D $\Delta&space;H&spa Answer : B Explanation :
60.
 The apparatus used to test acidity of aqueous solution is A pH meter B Ammeter C Hygrometer D Acid meter Answer : A Explanation :
61.
 The heat value of combustion of Gasoline is A 12600 kJ/kg B 14600 kJ/kg C 39400 kJ/kg D 47000 kJ/kg Answer : D Explanation :
62.
 Concentration of a material which is lethal to 50% animal is called A $LD_{50}$ B $LC_{50}$ C NOAEL D ADI Answer : A Explanation :
63.
 The buffer action of blood is due to the presence of A HCI and NaCI B $Cl^{-}&space;an C $Cl^{-}&space;an D $HCO_{3}^{-}&a Answer : D Explanation :
64.
 Which of the following appeared to be with a significant potential for accumulation through food chains  ? A DDT B Parathion C Lindane D Carbary Answer : A Explanation :
65.
 Soap helps in better cleaning of clothes because A Soap acts like catalyst B It reduces the surface tension of solution C It gives strength to solution D It absorbs the dirt Answer : B Explanation :
66.
 In a reaction of the type  A+B   →  C+D  one could ensure it to be a first order reaction by  : A Increasing the temperature B Increasing the concentration of a product C Increasing the concentration of a reactant D Adding a catalyst Answer : C Explanation :
67.
 Soldering of two metals is possible because of the property of  : A Viscosity B Osmosis C Cohesion D Surface tension Answer : C Explanation :
68.
 The deterioration of a metal by an electrochemical process is commonly termed as A Erosion B Corrosion C Passivation D Abrasion Answer : B Explanation :
69.
 Kinetics is the study of  : A The rate of chemical reaction B How fast the reactions go C The mechanisms and paths of the molecules take in joining from one reactant to products D All of these are correct Answer : D Explanation :
70.
 What is a common name for the substance which irritates lachrymal glands  ? A Tear Gas B Laughing Gas C Anaesthetic Gas D Noble Gas Answer : A Explanation :
71.
 Which of the following is not a commercial source of energy  ? A Coal B Petroleum C Natural Gas D Firewood Answer : D Explanation :
72.
 Even after sunset, the air near the Earth’s surface continue to receive heat due to A Terrestrial Radiation B Conduction C Convection D Insolation Answer : A Explanation :
73.
 Which of the process is known as nitrification  ? A Reaction of Nitrogen Monoxide with oxygen to form nitric acid B Reaction of Nitrogen dioxide with water to form nitric acid C Conversion of ammonia to nitrites D Conversion of nitrite to nitric oxide Answer : C Explanation :
74.
 The source of energy that causes the least global warming is A Coal B Geothermal energy C Natural Gas D Petroleum Answer : B Explanation :
75.
 Thermal electricity is generated by using which of these  ? A Coal only B Coal and Natural Gas only C Coal, Natural Gas and Petroleum D None of these Answer : C Explanation :
76.
 Sullage water is A Waste water released from kitchen B Waste water released from toilets C Waste water released from factories D Waste water released from hospitals Answer : A Explanation :
77.
 Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of A Open system B Closed system C Isobaric system D Isothermal system Answer : A Explanation :
78.
 ___________  is a by product of sewage treatment and can be decomposed to produce biogas A Sewage B Sludge C Sewer D Scum Answer : B Explanation :
79.
 The  ‘solid waste’  is also known as A Sedge B Toxic waste C Sludge D Scrubber Answer : C Explanation :
80.
 Which of the following has pH value 7  ? A Pure water B $H_{2}SO_{4}$   &n C Sodium Carbonate D HCl Answer : A Explanation :